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Mixing Li and Cs in the reduction of corannulene for the assembly of a cesium-capped sandwich with a hexanuclear heterometallic core.
The use of two alkali metals having the greatest ion size mismatch, Li and Cs, in the reduction of bowl-shaped corannulene (C20 H10 , 1), results in the preparation of a heterobimetallic organometallic self-assembly, [Cs(diglyme)]2 //[Li3 Cs3 (C20 H10 )2 (diglyme)2 ] (2). The X-ray crystallographic investigation of 2 revealed the formation of a triple-decker sandwich having a highly-charged hexanuclear core, (Li3 Cs3 )6+ , held between two tetrareduced corannulene decks. The sandwich is capped by external cesium ions filling the concave cavities of corannulene bowls. The average depth of two C20 H10 4- anions of 0.754(14) Å is significantly greater in 2 compared to the values of 0.241(2)-0.355(2) Å observed in the homometallic lithium sandwiches formed by tetrareduced corannulene, thus illustrating the unique flexibility of its carbon framework to adapt to different internal and external coordination environments.
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